W freakley



(No Model.) 2 Sheets-Sheet 2. W. PRBAKLBY.

, FURNAGE.

l N0 ;522,340 Patented July 3, 1894.

Fig: 2.

P766 Z xsl-bk@ parts by reason of the rapid and enforced cir- UNITED STAT-ns PATENT (3e-Fries.

WILLIAM FREAKLEY, OF STOKE-UPON-TRENT, ENGLAND.

FU RNACE.

SPECIFICATION forming part of Letters Patent N o. 522,340, dated July 3, 1894.

Application filed March 13, 1894.

`in Connection Therewith, of which the following is a specification.

The objects of my invention areito effect` greater economy in the consumption of fuel,

lto increase the efficiency, power and safety of the boilers to which such improved furnaces are applied, to permit much higher furnace temperatures, to permit greater rates of combustion and to enable inferior fuels and refuse to be'used with advantage in the generation cf steam, the boilers to which'such improved furnaces are applied being kept at a practically uniform temperature in alltheiry culation of water across the heating surfaces of such furnaces, thus avoiding the injurious results of unequal expansion and contraction, the furnaces being free to expand and contract while in use without unduly strain- .ing any part of the boilers to which such improved furnaces are attached, the said furnace-s being readily applied to existing boilers of various types.

In carrying my invention into practice I dispense with fire-bars and similar gratings for supporting burning fuel, by carrying such fuel directly upon the water-backed plates of such furnaces, thus enabling high temperatures to be produced, there being no dead plates, bars or other similar arrangement to melt or give way, the adherence of clinkers to the furnace plates is prevented thus enabling such clinkersv to be readily removed, the combustion of fuelis rendered practically complete and the formation ofk black smoke is diminished. With such furnaces I am able to use forced draft of high pressure so as to consume refuse coke 0r coal dust and inferior fuels to advantage, andgreatly increase the evaporativer power of the boilers to which suchimproved furnaces are attached. -Such furnaces I construct by any suitable means in the form of a horizontal Water-jacketed cyl inder consisting of an inner and an outer shell, which steel, iron, or other suitable metallic Serial No. 503,475. (No model.)v I

or steam generator, to each liue of which boiler I have shown attached a horizontal barless furnace made according to my'invention, one of the said furnaces being shown in transverse section.u Fig. 2 is a side sectional elevation of the fore part of the boiler shown at Fig. l, and of one of the furnaces attached thereto.

Similar letters referto similar parts throughout the several views. y

On reference to .the drawings a. represents `the `front part or portion of a two Iiued, or Lancashire boiler, to the Vfront end of each flue of which boiler I have shown attached by means of a metallic ring b a horizontal barless furnace c provided with a door c2, and a suitable number of air inlets or tuyeres d.

Annular wrought iron or other suitable metallic rings c3 and c4 being riveted, or otherwise suitably fitted or fixed between the inner and outer plates c5 and c6 at or near to each end of such furnaces, for the purpose of rendering the ends of such jackets or spaces water tight, a lining of fire-brick or other refractory material a2 being fitted or placed against the inside of the front plate c7 of such furnaces at their front ends, a metallic casing e is fitted or fixed to the exterior part of such furnaces by angle iron, rivets or other suitable means for the purpose of conducting forced blast, air or steam under pressure, or air and steam under pressure through the several tuyeres dinto the furnaces c,'the said blast being conveyed by the pipes y@,fzand f3 into the said casing e, the supply of the blast to the interior/of the said casing e being regulated by suitable valves or dampers g fitted to the lower interior part of the blast conducting pipes f2, f3, fuel being fed from `the lower part of the hoppers hattached to eccentrics j, rods 7c, levers Z and shaftng m driven by steam or other motive power, a sight-hole h2 being fitted to eachhopper to facilitate inspection of the interior of furnace.

While fuel in the 'interior of such furnaces is becoming incandescent, the water in the space between the inner and outer plates c5 and c6 is rapidly heated, and flows from such water-jacketed furnaces through pipes 'n in the direction shown by the arrows x into the interior of the boiler a and circulates therein, the coolest water, or the water at the lowest part of such boilers flowing therefrom through pipes p as indicated by arrows e' into the lower portion of the water space of the said furnaces c, the water being kept in` a state of circulation until steam is gener` ated therefrom. Heat and smoke from the fires of such furnaces pass into chambers a3 formed of or from fire-brick or other suitable refractory material a2 fitted or fixed in the front portionof each flue of the boiler a, and pass therefrom in the direction indicated by arrow a5 through the opening a, into and through the several fines of the boiler setting into the chimney stack, from whence it escapes into the atmosphere.

It will be understood that the refractory material or materials a2 of which the combustion chambers ai are made when rendered sufficiently in'candescent by the heat from the fires, destroys the noxious constituents of the flame and smoke. The lower portions of such horizontal water-jacketed furnaces are fitted with numerous small airpipes or tuyeres d conical or parallel in longitudinal section, and made of iron, steel, copper, brass or other suitable material, which tuyeres extend radially from the outside of the outer shell cG across the water space between the inner and outer plates c5, ci through the said inner plate to the interior of the firebox c, the said tuyeres being fixed, expanded, screwed or secured in other suitable manner into holes formed through the said inner and outer plates so as to be steam and water-tight, and form efficient stays. When it is desirable 'to strengthen that portion of the fire-box without air tubes or tuyeres, screwed stays or other suitable means are used for that purpose. In some cases I use corrugated or similar fire-boxes, in which cases as a rule screwed stays are dispensed with, the air-tubes or tuyeres being fixed in corrugated furnaces in a similar manner to those in plain furnaces. The lower part of such water-jacketed furnaces I fit with one or more inlet branches or pipes p, and the upper part of such furnaces with one or more outlet branches or pipes n which I attach at one end to the front plate of the boiler, and the other end of such inlet and outlet pipes to the outer shell c6 of the annular water space. The air casings c I lit or provide with asuitable door or opening for permitting ashes or dust to be readily removed or cleaned out from such casings.

I wish it to be understood that such waterjacketed barless furnaces may be used 'in connection with various types of boilers without refractory material a2, without air-casings e, and without fuel hoppers as shown on the drawings.

I-Iaving now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a boiler, the combination of the flue or fines, the refractory material in the front end thereof forming a combustion chamber, the horizontal barless furnace at the front end of the tlues or tube, the water jacket about the same, the pipes leading therefrom to the interior ot' the boiler, the air casing connected through suitable openings with the interior of the furnace and the fuel supply opening for the furnace, substantially as described.

2. A furnace for attachment toa horizontal boiler having a fuel chamber and adapted to fit against the front end of the boiler and of proper size to fit over the horizontal tube of the boiler to form a forward prolongation thereof, beyond the boiler, the water jacket surrounding the fire chamber and the pipes extending from said water jacket rearwardly and connecting with the interior ot' the boiler, substantially as described.

3. A furnace for attachment to a horizontal boiler having a fuel chamber and adapted to fit against the front end of the boiler over the horizontal tube to form a forward prolongation thereof beyond the boiler, the water jacket surrounding the fire chamber, the pipes extending from said water jacket rearwardly andconnecting with the interior of the boiler, the air forcing chamber beneath the water jacket and the connections therefrom extending to the fire box, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

WILLIAM FREAKLEY.

Witnesses:

JOHN NEWTON, JOHN HENRY CorEs'rAKE.

IOO 

